Smokeless self-cleaning grate.



PATENTED APR. 12, 1904.

. F. a; A. GIRTANNER.

'SMOKELESS SELF CLEANING GRATE.

APPLICATION FILED JULY 11, 1903.

N0 MODEL.

WITNESSES:

' .sists, essent1ally,in a self-cleaning furnace- UNITED STATES Patented April 12,, 1904.

PATENT OFFICE.

,ASSIGNORS TO UNITED TION OF YORK.

STATES MINING-8c TRADING (30., ACORPORA- SMOKELESS SELF-CLEANING GRATE.

1 srnormcnnon forming part of Least Patent No. 757,187, dated. April, 12, 1904.

App1i'catiou and July 11, 190's.

- To all whom it may concern:

Be it known that we, FREDERICK GIR'IAN- NER and ALICE GIRTANNER, citizens of the United States of America, residing at the city 5 of New York, in the county of New York and State of New York, have invented certain new and-useful Improvements in Smokeless Self- Cleaning'Gratesof which the following is a Y specification.

self-cleaning grates for steam-boiler-furnaces or other furnaces, and particularly to that class known as traveling grates, to which the fuel is fedfrom a-hopper, the whole being commonlyknown as mechanicalstokers.

The primary object of our invention is to provide a furnace-grate in which the fuel is continually'carried on traveling surfaces and the grate rendered self cleaning by an inter- 2o mediate roll or rolls and acooperating end roll, thus always-preserving a clean fire without hand raking or'dressing, while at the same time complete combustion without smoke is accomplished. i

With this object in view our invention congrate comprising a plurality of traveling grates arranged contiguous to each other and an intermediate clearing-roll, and also in 0 a self-cleaning furnace :grate comprising a "plurality of traveling grates arranged con- 'tiguousto each other, an intermediate clearing-roll, and an end clearing-roll. 3 The natureofour invention will best be understood when described in connection with the accompanying drawings, in which- Figure 1 represents a side elevationof a grate embodying our invention, the sa-mebeing shown applied to a boiler-furnace, which 4 latter is shown in section. Fig. 2 shows a modification of part of the grate.

- Similar letters and numerals of reference designate corresponding parts throughout both views ofthe drawings. Referring now to the drawings, theletter A designates a hopper into which the fuel charge is supplied either by hand or by a chute in a Our invention has reference to smokeless,

Serial No. 165,038. (No modeL) ceive the fuel discharged from the first traveling grate, andbetween the two adjacent ends of the two grates, which are at different levels, is placed a clearing-roll D. The traveling grate B is moved forwardly by'means of a suitable worm-wheel-l, engaging with a rack 3, attached to or forming part of the grate, and said worm-wheel 'bein g mounted on a shaft driven by any suitable means-for instance, a small motor M, driving a worm-shaft 4, en-

. gagingwith said-worm-wheel. The second or inclined grate is driven by a-chain-wheel 5, mounted on the shaft 6 of the end wheel '7 of 'the said grate, the other end of the second grate running over a chain-wheel 9, mounted on a, shaft 10, both said grates traveling in practically the same direction. At the terminal of the second grate C is mounted asec- 0nd. clearing-roll E, placed substantially ona level with the end shaft 10 of the-grate and adapted to divert the flow of ashes down- Wardly in view of the rotary movement of the bars of the grate opposite to such clearingroll, thus completely removing all'rernaining ashes'at this point.

The function of the clearing-roll D is to intersect and break up any and all clinkers which may be formed on the first traveling grate B, delivering or discharging the same 1 into the ash-pit below continuously during the movement of the traveling grates. Such portions of the clinkers as may pass over to the second grate are discharged through the agency of the rear clearing-r911 E audit of suflicient size are crushed or broken up by said roll.

It is of course to be understood that the traveling-grates may be of any well-known construction permitting the ashes to discharge between the bars and that the clearingroll D is so spaced as' to permit the passage, of ashes between it and the traveling grates.-

In practice we prefer to corrugate or flute the clearing-rolls, although they may be made practically plain.

I It is of course to be understood that in place 5 of two traveling grates three or more may be arranged in line, preferably with intermediate clearing-rollsieither between all the adjoining grates or alternating between grates, the last grate being preferably inclined, asshown in 10 the drawings, or in case of long furnaces one or more of the rear traveling grates maybe inclined.

It is of course to be understood-that both clearing-rolls, D and E are mounted to turn 5 freely with or upon" their shafts, although they could be driven slowly in the proper discharging directions.

I In the modification shown in Fig. 2 we have omitted the intermediate clearing-r01 ls D, the

2 ends of the grates being arranged as closely as possible together for permitting passage without interference."

\Vhat we claim as new is l. A self-cleaning furnace-grate compris- 25 ing a number. of traveling grates arranged contiguous to'each other and an intermediate clearing-roll, substantially as described.

2. A self-cleaning grate comprising a plu; rality of traveling grates arranged with their adjacent ends at diflerent levels, and a clear- 3 ing-roll arrangedat the end of the last traveling grate and having its periphery projecting above and below the axisof the endshaft of the said grate, substantially as described.

3. A self-cleaning furnace-grate compris- 3 5 ing a number of traveling grates arranged contiguous to each other, an intermediate clearing-roll adapted to crush and clear the clinkers intermediate of the adj ac'ent; ends of the grate, and an end clearing-roll, substantially as de- 4 scribed.

In testimony whereof We have hereunto set our hands in the presence oftwo subscribing witnesses.

FREDERICK GIRTANNER. ALICE GIRTANNER.

W'itnesses:

RAENA H. YUDIzKY, GEORGE EISENBRAM. 

